Unshocked equilibrated H-chondrites: A common low-temperature record from orthopyroxene iron-magnesium ordering

Details Unshocked equilibrated H-chondrites: A common low-temperature record from orthopyroxene iron-magnesium ordering Unshocked equilibrated H-chondrites: A common low-temperature record from orthopyroxene iron-magnesium ordering

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996m%26ps...31..388f&link_type=abstract

Meteoritics and Planetary Science, Vol. 31, p. 388-393 (1996)

Physics

7

Scientific paper

A suite of eight unshocked equilibrated H-chondrites ranging from petrographic type 4 to 6 (La Villa, Raguli, FRO 90076, Miami, FRO 90049, Estacado, FRO 90156 and Acfer 314) was selected for a systematic study of orthopyroxene cation ordering temperatures. The closure temperatures of the Fe-Mg exchange lie within the 384±48°C to 480±28°C range, regardless of the petrographic type. Data suggests that metamorphosed H-chondrites share a similar thermal evolution close to 380-480 °C. Indeed, this indicates that 114, 115 and 116 chondrites were located in petrogenetic environments characterized by similar temperature-time conditions when cooling through the above temperature interval.

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